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Posted by Jack Adams on April 5, 2007, 6:35 pm
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Here's an observation. Wireless both TDMA and CDMA Radio encoding
schemes don't handle sinusoids (what Touch Tones really are) very well.
They all perform some sort (ACELP encoding is typical) of voice
compression on the audio signal. It's pretty good for voice, enabling
reasonable voice phoneme construction, but fails miserably for things
like transmitting Touch Tones (or DTMF).
To make a long story short, there's nothing much you can do.
cindyanello@hotmail.com wrote:
> I have a "Fixed Wireless Terminal model GW1000BL" which is a device
> that takes a SIM chip and supplies dial tone back to any RJ11 device
> plugged into it. I am trying to use this terminal as a means to
> communicate alarm signals from my home alarm to the central station.
> I can get low speed pulse signals (called 4+2 in alarm speak) to go
> through - but when I try a higher rate protocol called Contact ID -
> the transmission fails. I dont know if the issue is a frequency
> limitation in the cell system design (Rogers Canada GSM) or perhaps a
> setting on the Fixed Wireless Terminal that could be adjusted to
> improve the throughput.
>
> The owners manual for the terminal talks of parameter settings that
> cen be changed - but they are all unfamiliar to me. The ones that
> seem like they might be of interest include:
>
> ISD Call (Enable/Disable)
> Loop Interruption
> PR Outgoing Call (Enable/Disable)
> 16 khz Outgoing Call (Enable/Disable)
> 16khz Pulse Duration
> Dial Time Out
> 16khz default value
> 16khz table
>
> Would anyone out there know if any of the above parameters might
> improve the data transmission rate for the terminal?
>
> Thanks, Cindy
>
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